Peel, core and thinly slice apples. Place apples in a 12 inch skillet or wide saucepan. Add 3/4 cup sugar, water and lemon juice and stir well. In small bowl, stir together the biscuit mix and milk until mix is moistened. Heat apple mixture to boiling. Drop dumpling mixture in 6 portions over apples. Simmer uncovered for 10 minutes. Sprinkle with cinnamon and sugar. Cover and simmer until apples are tender and dumplings are cooked through, about 10 minutes longer.